Moving from 1.0.0 to 2.0.0 is not a perfect process. There are a few things that break when doing so.

mpy files compatible with 1.0.0 are NOT compatible with 2.0.0 because MicroPython changed the format. A 2.0.0 bundle is available here. (Its built by changing the branch of circuitpython in the bundle repo before building it.)